Multi-scale modeling of shock initiation of a pressed energetic material I: The effect of void shapes on energy localization

Accurate simulations of the shock response heterogeneous energetic (HE) materials require closure models, which account for energy localization in micro-structure. In a multi-scale framework, is provided by reaction rate models that ignition and growth hotspots, allowing prediction overall macro-scale sensitivity HE material. present meso-informed (MES-IG) model, expressed as function pressure morphology void field pressed MES-IG, quantified terms limited number parameters: viz., porosity, size, shape (aspect ratio orientation). this paper, we quantify effects arbitrary variations shapes on meso-scale deposition rates. A collection voids extracted from scanning electron microscope (SEM) images real, HMX (octahydro-1,3,5,7-tetranitro-1,3,5,7-tetrazocine) samples classified into groups based their similarity shapes. Direct numerical (DNS) are performed highly contorted “real” shapes, calculated hotspot rates compared with values predicted MES-IG. It found while parameterization complex morphologies orientation aspect gives fairly good agreement between DNS MES-IG rates, intricate details impact characteristics to significant extent. This work suggests possible improvements microstructure adopting more detailed description